import { unref } from 'vue'
import type { ComputedRef, Ref } from 'vue'
import { cloneDeep, get, set, unset } from 'lodash-es'
import type { FormProps, FormSchemaInner as FormSchema } from '../types/form'
import { dateUtil } from '@/utils/dateUtil'
import { isArray, isEmpty, isFunction, isNil, isObject, isString } from '@/utils/is'

interface UseFormValuesContext {
  defaultValueRef: Ref<any>
  getSchema: ComputedRef<FormSchema[]>
  getProps: ComputedRef<FormProps>
  formModel: Recordable
}

/**
 * @description deconstruct array-link key. This method will mutate the target.
 */
function tryDeconstructArray(key: string, value: any, target: Recordable) {
  const pattern = /^\[(.+)\]$/
  if (pattern.test(key)) {
    const match = key.match(pattern)
    if (match && match[1]) {
      const keys = match[1].split(',')
      value = Array.isArray(value) ? value : [value]
      keys.forEach((k, index) => {
        set(target, k.trim(), value[index])
      })
      return true
    }
  }
}

/**
 * @description deconstruct object-link key. This method will mutate the target.
 */
function tryDeconstructObject(key: string, value: any, target: Recordable) {
  const pattern = /^\{(.+)\}$/
  if (pattern.test(key)) {
    const match = key.match(pattern)
    if (match && match[1]) {
      const keys = match[1].split(',')
      value = isObject(value) ? value : {}
      keys.forEach((k) => {
        set(target, k.trim(), value[k.trim()])
      })
      return true
    }
  }
}

export function useFormValues({
  defaultValueRef,
  getSchema,
  formModel,
  getProps,
}: UseFormValuesContext) {
  // Processing form values
  function handleFormValues(values: Recordable) {
    if (!isObject(values))
      return {}

    const res: Recordable = {}
    for (const item of Object.entries(values)) {
      let [, value] = item
      const [key] = item
      if (!key || (isArray(value) && value.length === 0) || isFunction(value))
        continue

      const transformDateFunc = unref(getProps).transformDateFunc
      if (isObject(value))
        value = transformDateFunc?.(value)

      if (isArray(value) && value[0]?.format && value[1]?.format)
        value = value.map(item => transformDateFunc?.(item))

      // Remove spaces
      if (isString(value)) {
        // remove params from URL
        if (value === '')
          value = undefined

        else
          value = value.trim()
      }
      if (!tryDeconstructArray(key, value, res) && !tryDeconstructObject(key, value, res)) {
        // 没有解构成功的，按原样赋值
        set(res, key, value)
      }
    }
    return handleRangeTimeValue(res)
  }

  /**
   * @description: Processing time interval parameters
   */
  function handleRangeTimeValue(values: Recordable) {
    const fieldMapToTime = unref(getProps).fieldMapToTime

    if (!fieldMapToTime || !Array.isArray(fieldMapToTime))
      return values

    for (const [field, [startTimeKey, endTimeKey], format = 'YYYY-MM-DD'] of fieldMapToTime) {
      if (!field || !startTimeKey || !endTimeKey)
        continue

      // If the value to be converted is empty, remove the field
      if (!get(values, field)) {
        unset(values, field)
        continue
      }

      const [startTime, endTime]: string[] = get(values, field)

      const [startTimeFormat, endTimeFormat] = Array.isArray(format) ? format : [format, format]

      if (!isNil(startTime) && !isEmpty(startTime))
        set(values, startTimeKey, formatTime(startTime, startTimeFormat))

      if (!isNil(startTime) && !isEmpty(startTime))
        set(values, endTimeKey, formatTime(endTime, endTimeFormat))

      unset(values, field)
    }

    return values
  }

  function formatTime(time: string, format: string) {
    if (format === 'timestamp')
      return dateUtil(time).unix()

    else if (format === 'timestampStartDay')
      return dateUtil(time).startOf('day').unix()

    return dateUtil(time).format(format)
  }

  function initDefault() {
    const schemas = unref(getSchema)
    const obj: Recordable = {}
    schemas.forEach((item) => {
      const { defaultValue, defaultValueObj } = item
      const fieldKeys = Object.keys(defaultValueObj || {})
      if (fieldKeys.length) {
        // eslint-disable-next-line array-callback-return
        fieldKeys.map((field) => {
          obj[field] = defaultValueObj![field]
          if (formModel[field] === undefined)
            formModel[field] = defaultValueObj![field]
        })
      }
      if (!isNil(defaultValue)) {
        obj[item.field] = defaultValue

        if (formModel[item.field] === undefined)
          formModel[item.field] = defaultValue
      }
    })
    defaultValueRef.value = cloneDeep(obj)
  }

  return { handleFormValues, initDefault }
}
